12V 400Ah 250A Discharge / 250A Charge BMS w/ Low Temp Charge Cut-off LFP Lithium Battery w/ BCI: Group 8D plastic case

The AMPS 400Ah 12V LiFePO4/LFP Deep Cycle battery is the perfect battery for systems including marine, RV, van, and off-grid!

The AMPS 400Ah 12v lithium battery has more usable watts than (3) BCI: 8D 255Ah Lifeline AGM batteries with less than 25% of the weight, a better warranty and a much longer life at a comparable cost.

AMPS 400 amp hour, nominal 12.8 volt battery weighs under 100 pounds. The maximum continuous discharge current is 250 amps with a peak discharge current of 500A for 5 seconds.

The maximum charge current is 250 amps with a recommended charge current of 40-100A for maximum battery life. The low temperature charge protection ensures that the cells will not be damaged should freezing conditions occur.

Upgrade from lead-acid batteries to AMPS lithium iron phosphate (LiFePO4/LFP) batteries and discover the difference that light weight, zero maintenance, long life and more available energy makes!

STORAGE CAPACITY
This battery has a storage capacity of 400 ampere hours (Ah)
AMPS batteries provide consistent power for all 400 amp hours. AMPS LiFePO4 batteries have a flat voltage curve, which means they have a steady power output as the battery discharges. The power output will not dramatically drop like similar sized Lead Acid, AGM, Gel or Carbon batteries.

ENERGY
5120 (Wh) Watt Hours = 400 Amp Hours x 12.8 Nominal Voltage

BATTERY CONSTRUCTION

AMPS batteries consist of quality cells and a robust BMS (battery management system).

The high quality LiFePO4 cells are significantly safer and provide 3 to 5 times the life of other lithium chemistries such as Cobalt Oxide(LiCoO2) – LCO, Manganese Oxide (LiMn2O4) – LMO, Nickel Manganese Cobalt Oxide (LiNiMnCoO2) – NMC and Nickel Cobalt Aluminum Oxide (LiNiCoAlO2) – NCA. Lithium Iron Phosphate or Lithium Ferro Phosphate (LiFePO4) – LFP and Lithium Titanate (Li2TiO3) – LTO are the safest lithium chemistries. LFP and LTO cells are not subject to thermal runaway explosion and fire with LFP being significantly less expensive than LTO. LFP cells are the brawn of the battery providing long life, consistent energy and safety.

The Battery Management System or BMS is the brain of the battery. A high quality and robust BMS ensures that the cells are maintained and maximizes the capacity over the life of the cells. One of the reasons of premature battery failure is a faulty BMS.

Many lower quality BMS will not allow batteries to be placed in series or parallel and do not offer low temperature protection.

The BMS has active protection with circuits and temperature probes that provides battery protection for increased performance and longer life.

Protections provided by the BMS include:
– cell balancing: a technique that improves battery life by maximizing the capacity of a battery pack ensuring that all of its energy is available for use
– low voltage cutoff: protects your cells from reaching a depth of discharge that may damage them and reduce their lifespan
– high voltage cutoff: protects your batteries from excessive high voltage that may damage the cells or BMS circuitry
– short circuit protection
– high temperature protection: prevents damage to electronics components, which may arise due to the excess heat
– low temperature charge cut-off: LFP cells can be permanently damaged if charged in a frozen state. AMPS LFP batteries can be safely discharged up to -20F

DISCHARGING
The maximum continuous discharge rating is 250 amp with up to 500 amp surge pulse for 5 seconds. The flat discharge voltage curve provides continuous higher voltage throughout the discharge cycle compared to Lead Acid, AGM, Gel or Carbon batteries. Permanent damage and capacity loss can occur in Lead Acid, AGM, Gel or Carbon batteries if discharged below 50%. AMPS lithium battery can be discharged 100% without damage to the battery but a max discharge of 80% is recommended.

CHARGING
The maximum charge current is 300 amps. The recommended charge current is 40-100 amps. The recommended constant charge voltage is 14.5-14.6 Volts. AMPS lithium batteries have a 99% charge efficiency which means every amp and every watt goes into the battery without loss. The BMS regulates the charging with a constant voltage of 14.6V and constant amps until full. Together, this means a faster charge.
Battery charges for lead based batteries reduce voltage and amps as the battery charges to prevent overcharging. Lead acid batteries typically have coulombic (Ah) efficiencies of around 85% and energy (Wh) efficiencies of around 70% over most of the SOC range.

Using a Lead Acid/SLA charger will be less effective and can reduce battery life.
A LiFePO4/LFP battery charger is recommended. A LiFePO4/LFP battery charger is what is called a constant voltage / constant current charger. The charger will generate a constant 14.6 volts at the rated design amperage until the battery is full and the BMS cuts off the incoming charge.

LIFECYCLES (BATTERY LIFESPAN)
The AMPS 400 Ah 12.8V LiFePO4/LFP Deep Cycle battery has a life expectancy of 3000-5000. Approximately 75-80% of the battery capacity will remain after 3000 cycles in applications recharging at 0.5C or lower. Life spans can exceed 5000 cycles under the right conditions. Lead Acid, AGM, Gel or Carbon batteries have cycle life of 300 to 1000 depending on the manufacturer with a max discharge of 50%.

VOLTAGE
The nominal voltage is 12.8V. AMPS Lithium 12V batteries can be allows up to (4) batteries in series for systems up to 48V and up to (4) batteries in parallel.

OPERATING TEMPERATURE
AMPS LFP lithium batteries can be safely discharged from -20F min to +130F max optimal operating temperatures. AMPS LFP batteries have low temperature charge cut-off protection. This will protect the battery from damage if charged below 32F.

TERMINALS
M8 copper post with M8 316ss washer and nut included.

SIZE
This battery is a BCI Group 8D equivalent.
520 x 265 x 245 mm or 20.5” x 10.5” x 9.65”

The usable capacity is over 3 times that of a lead-acid battery of the same group size. This is for deep cycle only and not for engine starting.

WEIGHT
93 lbs – over 40% lighter than a similar size lead acid battery.

WARRANTY
AMPS lithium batteries have a 12 year warranty that covers the cells and BMS. See the warranty for specifics and exclusions.

NOT FOR STARTING ENGINES
This is a deep cycle 12v battery. Not designed for starting engines.